Long-Term Debt (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Debt Disclosure [Line Items]
Line of Credit Facility, Potential Additional Borrowing Capacity	$ 3,000,000
Senior secured revolving credit line	797,647	$ 725,500
Other Long-term Debt	195	213
Total debt	803,274	732,126
Less: Current maturities of long-term debt	4,860	5,883
Long-term debt	798,414	726,243
Line of Credit Facility, Outstanding Amount, USD Borrowings	766,500
Line of Credit Facility, Amount Outstanding, GBP Borrowings	31,100
Foreign
Debt Disclosure [Line Items]
Foreign loans	$ 5,432	$ 6,413